21313707 has 4 divisors (see below), whose sum is σ = 28418280. Its totient is φ = 14209136.

The previous prime is 21313697. The next prime is 21313729. The reversal of 21313707 is 70731312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21313707 - 2⁸ = 21313451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21313207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3552282 + ... + 3552287.

It is an arithmetic number, because the mean of its divisors is an integer number (7104570).

Almost surely, 2^21313707 is an apocalyptic number.

21313707 is a deficient number, since it is larger than the sum of its proper divisors (7104573).

21313707 is an equidigital number, since it uses as much as digits as its factorization.

21313707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7104572.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 21313707 is about 4616.6770517332. The cubic root of 21313707 is about 277.2594327733.

The spelling of 21313707 in words is "twenty-one million, three hundred thirteen thousand, seven hundred seven".